Lasers have now been proven to promote hair growth in persons with androgenic alopecia who have Norwood Hamilton Classifications of IIa to V and Fitzpatrick Skin Types I to IV.

In the study, subjects who had been frequently exposed to laser light had shown a significant increase in their hair density over a 26 week period then those who were not exposed to the laser. No one suffered any side effects. Subjects had also shown a greater number of re-grown hairs than the subject in the placebo group. Lasers have satisfied the FDA’s criteria for promoting hair growth.